<template>
  <div>
    <div class="banner1" style="width:100%">
      <h3 style="float:left;margin-top:20px;">新增Banner图</h3>
      <h6 style="float:left;margin-top:20px;width:100%;">* 选择图片：（建议图片尺寸：750X304）</h6>
    </div>
    <div class="shangchuan">
      <el-upload
        class="avatar-uploader"
        action="https://jsonplaceholder.typicode.com/posts/"
        :show-file-list="false"
        :on-success="handleAvatarSuccess"
        :before-upload="beforeAvatarUpload"
      >
        <img
          v-if="imageUrl"
          :src="imageUrl"
          class="avatar"
          style="border:2px solid black;width:349px;height:145px;margin-top:20px"
        />
        <i
          v-else
          class="el-icon-plus avatar-uploader-icon"
          style="border:2px solid black;width:349px;height:145px;background-color:white;
          float:left;
          margin-top:20px"
        ></i>
      </el-upload>
    </div>
    <div class="btton1">
      <router-link to="/banner">
        <el-button type="primary">添加</el-button>
      </router-link>

      <el-button>取消</el-button>
    </div>
  </div>
</template>
<script>
export default {
  data() {
    return {
      imageUrl: ""
    };
  },
  methods: {
    handleAvatarSuccess(res, file) {
      this.imageUrl = URL.createObjectURL(file.raw);
    },
    beforeAvatarUpload(file) {
      const isJPG = file.type === "image/jpeg";
      const isLt2M = file.size / 1024 / 1024 < 2;

      if (!isJPG) {
        this.$message.error("上传头像图片只能是 JPG 格式!");
      }
      if (!isLt2M) {
        this.$message.error("上传头像图片大小不能超过 2MB!");
      }
      return isJPG && isLt2M;
    }
  }
};
</script>
<style scoped>
.avatar-uploader .el-upload {
  border: 1px dashed #d9d9d9;
  border-radius: 6px;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}
.avatar-uploader .el-upload:hover {
  border-color: #409eff;
}
.avatar-uploader-icon {
  font-size: 28px;
  color: #8c939d;
  width: 178px;
  height: 178px;
  line-height: 178px;
  text-align: center;
}
.avatar {
  width: 178px;
  height: 178px;
  display: block;
  float: left;
  margin-top: 30px;
}
</style>;
